Different internals (forged/semi-forged) makes a difference. Gearbox is the same GETRAG Powershift but different gearing ratios.
I wont try to convince anyone. If you wanna think its the same setup then go ahead =)

This thread (you) is the first I've heard there is any difference between the "i" and "is" engines. But, I'd believe it if you can provide some documentation. In the end, many people will believe what they want regardless, but documentation beats conversation. And don't tell me to google it or search because you're the one making the claim.

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